Re: [beagleboard] Re: CPU speed and kernel builds

[cwrseckford]

On Saturday, March 22, 2014 8:51:48 AM UTC, robert.berger wrote:
>
> Hi, 
>
> 
>
> that's my config: http://pastebin.com/VZS4epai 
>
> Regards, 
>
> Robert 
>
>
>
Thanks, that was a lifesaver.  It compiled fine with the 3.14 kernel, and 
brought up all the /sys/.../cpu/... stuff, and the BBB defaulted to 1GHz on 
the performance governor.  So now everything is working with 3.14, all I 
have to do is find out _which_ driver was missing, and rebuild my current 
kernel

Many, many thanks - Will
 

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Re: [beagleboard] Re: CPU speed and kernel builds

[Robert Berger]

Hi,

On 03/22/2014 09:33 AM, cwrseckf...@gmail.com wrote:
> 
> 
> On Saturday, March 22, 2014 7:51:28 AM UTC, robert.berger wrote:
> 
> Hi,
> 
> Did you try compile the cpupower tool [1] which comes with the kernel?
> 
> 
> 
> Yes, but the cpufreq directories under /sys just aren't there.  It has
> to be a kernel config problem; could you please pastebin your 3.13
> kernel config somewhere, and I'll try building 3.14 against that.

that's my config: http://pastebin.com/VZS4epai

Regards,

Robert

> 
> Will
>  
> 
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Re: [beagleboard] Re: CPU speed and kernel builds

[Gerald Coley]

We test the boards at the factory at 1GHz on USB and DC prior to shipping.
The issue there is if you have a SD card, then that can exceed the 500mA
when it is being hit hard.

Default is the governor is active and it runs at 300MHz so unless you give
it something meaningful to do, it sits at 300MHz. Load it up, and it goes
to 1GHz.

Gerald


On Fri, Mar 21, 2014 at 12:37 PM, William Hermans  wrote:

> That would be false, but ive heard teh same stories.
>
> I run my own BBB from USB, and at idle it runs at 300Mhz, then once under
> a load of 66% or greater it will swing up to 1Ghz. ondemand governor I do
> believe.
>
>
> On Fri, Mar 21, 2014 at 10:34 AM, Scott Force wrote:
>
>> How are you powering your BBB?
>> I've heard that if you power it via USB instead of the 5V DC connector,
>> that the CPU speed will be reduced due to the lower power.
>>
>>
>> On 21 March 2014 10:38, Dennis Cote  wrote:
>>
>>> On Friday, March 21, 2014 8:24:50 AM UTC-6, cwrse...@gmail.com wrote:

 Okay, I'm officially confused.  I've been trying to increase the speed
 of my BBB from the default 550MHz to 1GHz, and failing;

>>>
>>>  How are you measuring the CPU frequency?
>>>
>>> I have noticed that cpufreq-info gives different answers depending upon
>>> the arguments. With no arguments mine always returns 300 MHz when running
>>> with the 300 1000 ondemand governor. If I use the "cpufreq-info -f" command
>>> I get the same results, always 300 MHz, both at idle and under load. If I
>>> use the "sudo cpufreq-info -w" command, I get 300 MHz at idle and 1000 MHz
>>> under load. The -w option reads the frequency from the hardware and
>>> requires root privledges.
>>>
>>> HTH
>>> Dennis Cote
>>>
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>>
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Re: [beagleboard] Re: CPU speed and kernel builds

[William Hermans]

That would be false, but ive heard teh same stories.

I run my own BBB from USB, and at idle it runs at 300Mhz, then once under a
load of 66% or greater it will swing up to 1Ghz. ondemand governor I do
believe.


On Fri, Mar 21, 2014 at 10:34 AM, Scott Force wrote:

> How are you powering your BBB?
> I've heard that if you power it via USB instead of the 5V DC connector,
> that the CPU speed will be reduced due to the lower power.
>
>
> On 21 March 2014 10:38, Dennis Cote  wrote:
>
>> On Friday, March 21, 2014 8:24:50 AM UTC-6, cwrse...@gmail.com wrote:
>>>
>>> Okay, I'm officially confused.  I've been trying to increase the speed
>>> of my BBB from the default 550MHz to 1GHz, and failing;
>>>
>>
>>  How are you measuring the CPU frequency?
>>
>> I have noticed that cpufreq-info gives different answers depending upon
>> the arguments. With no arguments mine always returns 300 MHz when running
>> with the 300 1000 ondemand governor. If I use the "cpufreq-info -f" command
>> I get the same results, always 300 MHz, both at idle and under load. If I
>> use the "sudo cpufreq-info -w" command, I get 300 MHz at idle and 1000 MHz
>> under load. The -w option reads the frequency from the hardware and
>> requires root privledges.
>>
>> HTH
>> Dennis Cote
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
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>>
>
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Re: [beagleboard] Re: CPU speed and kernel builds

[Gerald Coley]

That only applies to the BeagleBone White.

Gerald



On Fri, Mar 21, 2014 at 12:34 PM, Scott Force wrote:

> How are you powering your BBB?
> I've heard that if you power it via USB instead of the 5V DC connector,
> that the CPU speed will be reduced due to the lower power.
>
>
> On 21 March 2014 10:38, Dennis Cote  wrote:
>
>> On Friday, March 21, 2014 8:24:50 AM UTC-6, cwrse...@gmail.com wrote:
>>>
>>> Okay, I'm officially confused.  I've been trying to increase the speed
>>> of my BBB from the default 550MHz to 1GHz, and failing;
>>>
>>
>>  How are you measuring the CPU frequency?
>>
>> I have noticed that cpufreq-info gives different answers depending upon
>> the arguments. With no arguments mine always returns 300 MHz when running
>> with the 300 1000 ondemand governor. If I use the "cpufreq-info -f" command
>> I get the same results, always 300 MHz, both at idle and under load. If I
>> use the "sudo cpufreq-info -w" command, I get 300 MHz at idle and 1000 MHz
>> under load. The -w option reads the frequency from the hardware and
>> requires root privledges.
>>
>> HTH
>> Dennis Cote
>>
>> --
>> For more options, visit http://beagleboard.org/discuss
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>>
>
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Re: [beagleboard] Re: CPU speed and kernel builds

[Scott Force]

How are you powering your BBB?
I've heard that if you power it via USB instead of the 5V DC connector,
that the CPU speed will be reduced due to the lower power.


On 21 March 2014 10:38, Dennis Cote  wrote:

> On Friday, March 21, 2014 8:24:50 AM UTC-6, cwrse...@gmail.com wrote:
>>
>> Okay, I'm officially confused.  I've been trying to increase the speed
>> of my BBB from the default 550MHz to 1GHz, and failing;
>>
>
>  How are you measuring the CPU frequency?
>
> I have noticed that cpufreq-info gives different answers depending upon
> the arguments. With no arguments mine always returns 300 MHz when running
> with the 300 1000 ondemand governor. If I use the "cpufreq-info -f" command
> I get the same results, always 300 MHz, both at idle and under load. If I
> use the "sudo cpufreq-info -w" command, I get 300 MHz at idle and 1000 MHz
> under load. The -w option reads the frequency from the hardware and
> requires root privledges.
>
> HTH
> Dennis Cote
>
> --
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>

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